id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,guest,host
8987,Slow boot / high CPU load / snapshot delete stalls on 12 core Family 10h Opteron Ubuntu 10.04,cruftex,,"I have some ""multiple"" strange behaviours on a new host system.
Parameters:
Host: Ubuntu 10.04 aka Lucid 64 Bit, Kernel 2.6.32-31
Guest: Ubuntu 10.04 aka Lucid 32 Bit, Kernel 2.6.32-31
Virtualbox Version 4.0.8
AMD Opteron(tm) Processor 6174
I also did test with 11.04 and Kernel 2.6.38-8, and experimented with various guest options (ioapic, acpi, etc.). Overall, the behaviour keeps identicall.
Observations:
1.
Slow output on the UART during boot.
2.
The boot is slow. The process takes 55 seconds when 12 cores are enabled and 10 seconds when only 1 core is enabled.
3.
When switching to multiple CPUs in the guest the UART output is corrupted during the initial boot phase.
4.
When deleting a snapshot it stalls at 90% and the following processes run at the given CPU %, 63% VBoxSVC, 62% VBoxHeadless, 29% VBoxXPCOMIPCD. I wait for 20 minutes, no change. Then I aborted via rebooting the system.
The attached logs concentrate on the boot of in 10.04 with identical VM parameters, I did the following comparisons:
12core:
All cores are enabled
1core:
disabled all but one cpu with:
for I in 1 2 3 4 5 6 7 8 9 10 11; do echo 0 > /sys/devices/system/cpu/cpu$I/online; done
downcore:
Enabled BIOS Downcore setting to 1 core, which gives me 2 cores in reality.
1core and downcore have fine behaviour. So when the host system is booted
with only 2 cores enabled, everything is fine!
",defect,closed,major,VMM/HWACCM,VirtualBox 4.0.8,fixed,"slow boot, high cpu usage, Opteron Family 10h, Ubuntu 10.04, Ubuntu 11.04",,Linux,Linux